A student makes 10 one-second measurements of the disintegration of a sample of a long-lived radioactive isotope and obtains the following valures:
3,0,2,1,2,4,0,1,2,5
How long should the student count to establish the rate to an uncertainty of 1 percent?
a 80s
b 160s
c 2000s
d 5000s
e 6400s